[S390] lockdep: fix compile bug

arch/s390/kernel/built-in.o: In function `cleanup_io_leave_insn':
mem_detect.c:(.text+0x10592): undefined reference to `lockdep_sys_exit'

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

authored by Heiko Carstens and committed by Martin Schwidefsky af4c6874 cc835f78

+2
+2
arch/s390/kernel/entry.S
··· 1116 1116 .Ltrace_irq_on: .long trace_hardirqs_on 1117 1117 .Ltrace_irq_off: 1118 1118 .long trace_hardirqs_off 1119 + #endif 1120 + #ifdef CONFIG_LOCKDEP 1119 1121 .Llockdep_sys_exit: 1120 1122 .long lockdep_sys_exit 1121 1123 #endif